CREATE TABLE IF NOT EXISTS `training_sessions` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `coach_id` INT NOT NULL,
  `name` VARCHAR(255) NOT NULL,
  `description` TEXT,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  FOREIGN KEY (`coach_id`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;